FreeBSD Security Advisory FreeBSD-SA-09:14.devfs
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FreeBSD Security Advisory FreeBSD-SA-09:14.devfs
by FreeBSD Security Advisories
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 ============================================================================= FreeBSD-SA-09:14.devfs Security Advisory The FreeBSD Project Topic: Devfs / VFS NULL pointer race condition Category: core Module: kern Announced: 2009-10-02 Credits: Przemyslaw Frasunek Affects: FreeBSD 6.x and 7.x Corrected: 2009-05-18 10:41:59 UTC (RELENG_7, 7.2-STABLE) 2009-10-02 18:09:56 UTC (RELENG_7_2, 7.2-RELEASE-p4) 2009-10-02 18:09:56 UTC (RELENG_7_1, 7.1-RELEASE-p8) 2009-10-02 18:09:56 UTC (RELENG_6, 6.4-STABLE) 2009-10-02 18:09:56 UTC (RELENG_6_4, 6.4-RELEASE-p7) 2009-10-02 18:09:56 UTC (RELENG_6_3, 6.3-RELEASE-p13) For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://security.FreeBSD.org/>. I. Background The device file system (devfs) provides access to system devices, such as storage devices and serial ports, via the file system namespace. VFS is the Virtual File System, which abstracts file system operations in the kernel from the actual underlying file system. II. Problem Description Due to the interaction between devfs and VFS, a race condition exists where the kernel might dereference a NULL pointer. III. Impact Successful exploitation of the race condition can lead to local kernel privilege escalation, kernel data corruption and/or crash. To exploit this vulnerability, an attacker must be able to run code with user privileges on the target system. IV. Workaround An errata note, FreeBSD-EN-09:05.null has been released simultaneously to this advisory, and contains a kernel patch implementing a workaround for a more broad class of vulnerabilities. However, prior to those changes, no workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the RELENG_7_2, RELENG_7_1, RELENG_6_4, or RELENG_6_3 security branch dated after the correction date. 2) To patch your present system: The following patches have been verified to apply to FreeBSD 6.3, 6.4, 7.1, and 7.2 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 6.x] # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs6.patch # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs6.patch.asc [FreeBSD 7.x] # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs7.patch # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs7.patch.asc b) Apply the patch. # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. CVS: Branch Revision Path - ------------------------------------------------------------------------- RELENG_6 src/sys/fs/devfs/devfs_vnops.c 1.114.2.17 RELENG_6_4 src/UPDATING 1.416.2.40.2.11 src/sys/conf/newvers.sh 1.69.2.18.2.13 src/sys/fs/devfs/devfs_vnops.c 1.114.2.16.2.2 RELENG_6_3 src/UPDATING 1.416.2.37.2.18 src/sys/conf/newvers.sh 1.69.2.15.2.17 src/sys/fs/devfs/devfs_vnops.c 1.114.2.15.2.1 RELENG_7 src/sys/fs/devfs/devfs_vnops.c 1.149.2.9 RELENG_7_2 src/UPDATING 1.507.2.23.2.7 src/sys/conf/newvers.sh 1.72.2.11.2.8 src/sys/fs/devfs/devfs_vnops.c 1.149.2.8.2.2 RELENG_7_1 src/UPDATING 1.507.2.13.2.11 src/sys/conf/newvers.sh 1.72.2.9.2.12 src/sys/fs/devfs/devfs_vnops.c 1.149.2.4.2.2 - ------------------------------------------------------------------------- Subversion: Branch/path Revision - ------------------------------------------------------------------------- stable/6/ r197715 releng/6.4/ r197715 releng/6.3/ r197715 stable/7/ r192301 releng/7.2/ r197715 releng/7.1/ r197715 - ------------------------------------------------------------------------- VII. References The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-09:14.devfs.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iD8DBQFKxltlFdaIBMps37IRAp4zAJwJEwIySGqxH4EXwc0wjkDXlcTb1wCfTltO Syds53GSM0YbsMNUVMGsLaU= =exPZ -----END PGP SIGNATURE----- _______________________________________________ freebsd-security@... mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "freebsd-security-unsubscribe@..." |
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Re: FreeBSD Security Advisory FreeBSD-SA-09:14.devfs
by budsz
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On Sat, Oct 3, 2009 at 3:12 AM, FreeBSD Security Advisories
<security-advisories@...> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > ============================================================================= > FreeBSD-SA-09:14.devfs Security Advisory > The FreeBSD Project > > Topic: Devfs / VFS NULL pointer race condition > > Category: core > Module: kern > Announced: 2009-10-02 > Credits: Przemyslaw Frasunek > Affects: FreeBSD 6.x and 7.x > Corrected: 2009-05-18 10:41:59 UTC (RELENG_7, 7.2-STABLE) > 2009-10-02 18:09:56 UTC (RELENG_7_2, 7.2-RELEASE-p4) > 2009-10-02 18:09:56 UTC (RELENG_7_1, 7.1-RELEASE-p8) > 2009-10-02 18:09:56 UTC (RELENG_6, 6.4-STABLE) > 2009-10-02 18:09:56 UTC (RELENG_6_4, 6.4-RELEASE-p7) > 2009-10-02 18:09:56 UTC (RELENG_6_3, 6.3-RELEASE-p13) > > For general information regarding FreeBSD Security Advisories, > including descriptions of the fields above, security branches, and the > following sections, please visit <URL:http://security.FreeBSD.org/>. > > I. Background > > The device file system (devfs) provides access to system devices, such as > storage devices and serial ports, via the file system namespace. > > VFS is the Virtual File System, which abstracts file system operations in > the kernel from the actual underlying file system. > > II. Problem Description > > Due to the interaction between devfs and VFS, a race condition exists > where the kernel might dereference a NULL pointer. > > III. Impact > > Successful exploitation of the race condition can lead to local kernel > privilege escalation, kernel data corruption and/or crash. > > To exploit this vulnerability, an attacker must be able to run code with user > privileges on the target system. > > IV. Workaround > > An errata note, FreeBSD-EN-09:05.null has been released simultaneously to > this advisory, and contains a kernel patch implementing a workaround for a > more broad class of vulnerabilities. However, prior to those changes, no > workaround is available. > > V. Solution > > Perform one of the following: > > 1) Upgrade your vulnerable system to 6-STABLE, or 7-STABLE, or to the > RELENG_7_2, RELENG_7_1, RELENG_6_4, or RELENG_6_3 security branch > dated after the correction date. > > 2) To patch your present system: > > The following patches have been verified to apply to FreeBSD 6.3, 6.4, > 7.1, and 7.2 systems. > > a) Download the relevant patch from the location below, and verify the > detached PGP signature using your PGP utility. > > [FreeBSD 6.x] > # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs6.patch > # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs6.patch.asc > > [FreeBSD 7.x] > # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs7.patch > # fetch http://security.FreeBSD.org/patches/SA-09:14/devfs7.patch.asc > > b) Apply the patch. > > # cd /usr/src > # patch < /path/to/patch > > c) Recompile your kernel as described in > <URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the > system. > > VI. Correction details > > The following list contains the revision numbers of each file that was > corrected in FreeBSD. > > CVS: > > Branch Revision > Path > - ------------------------------------------------------------------------- > RELENG_6 > src/sys/fs/devfs/devfs_vnops.c 1.114.2.17 > RELENG_6_4 > src/UPDATING 1.416.2.40.2.11 > src/sys/conf/newvers.sh 1.69.2.18.2.13 > src/sys/fs/devfs/devfs_vnops.c 1.114.2.16.2.2 > RELENG_6_3 > src/UPDATING 1.416.2.37.2.18 > src/sys/conf/newvers.sh 1.69.2.15.2.17 > src/sys/fs/devfs/devfs_vnops.c 1.114.2.15.2.1 > RELENG_7 > src/sys/fs/devfs/devfs_vnops.c 1.149.2.9 > RELENG_7_2 > src/UPDATING 1.507.2.23.2.7 > src/sys/conf/newvers.sh 1.72.2.11.2.8 > src/sys/fs/devfs/devfs_vnops.c 1.149.2.8.2.2 > RELENG_7_1 > src/UPDATING 1.507.2.13.2.11 > src/sys/conf/newvers.sh 1.72.2.9.2.12 > src/sys/fs/devfs/devfs_vnops.c 1.149.2.4.2.2 > - ------------------------------------------------------------------------- > > Subversion: > > Branch/path Revision > - ------------------------------------------------------------------------- > stable/6/ r197715 > releng/6.4/ r197715 > releng/6.3/ r197715 > stable/7/ r192301 > releng/7.2/ r197715 > releng/7.1/ r197715 > - ------------------------------------------------------------------------- > > VII. References > > The latest revision of this advisory is available at > http://security.FreeBSD.org/advisories/FreeBSD-SA-09:14.devfs.asc > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (FreeBSD) > > iD8DBQFKxltlFdaIBMps37IRAp4zAJwJEwIySGqxH4EXwc0wjkDXlcTb1wCfTltO > Syds53GSM0YbsMNUVMGsLaU= > =exPZ > -----END PGP SIGNATURE----- > _______________________________________________ > freebsd-security@... mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-security > To unsubscribe, send any mail to "freebsd-security-unsubscribe@..." > Hi folks, I just got some problem when compling my kerne. Here we go: rm -f hack.c MAKE=make sh /usr/src/sys/conf/newvers.sh WILLSZPROXY cc -c -O -pipe -std=c99 -g -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wundef -Wno-pointer-sign -fformat-extensions -nostdinc -I. -I/usr/src/sys -I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -ffreestanding -Werror vers.c linking kernel.debug kern_fork.o(.text+0x1d18): In function `fork1': /usr/src/sys/kern/kern_fork.c:737: undefined reference to `knote_fork' *** Error code 1 Stop in /usr/obj/usr/src/sys/WILLSZPROXY. *** Error code 1 Stop in /usr/src. *** Error code 1 Stop in /usr/src. My box running FreeBSD 7.2-STABLE. Thanks in advance. -- budsz _______________________________________________ freebsd-security@... mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "freebsd-security-unsubscribe@..." |
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Re: FreeBSD Security Advisory FreeBSD-SA-09:14.devfs
by Bjoern A. Zeeb
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On Mon, 5 Oct 2009, budsz wrote:
> On Sat, Oct 3, 2009 at 3:12 AM, FreeBSD Security Advisories > <security-advisories@...> wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> ============================================================================= >> FreeBSD-SA-09:14.devfs Security Advisory >> The FreeBSD Project >> >> Topic: Devfs / VFS NULL pointer race condition >> >> Category: core >> Module: kern >> Announced: 2009-10-02 >> Credits: Przemyslaw Frasunek >> Affects: FreeBSD 6.x and 7.x >> Corrected: 2009-05-18 10:41:59 UTC (RELENG_7, 7.2-STABLE) >> 2009-10-02 18:09:56 UTC (RELENG_7_2, 7.2-RELEASE-p4) >> 2009-10-02 18:09:56 UTC (RELENG_7_1, 7.1-RELEASE-p8) >> 2009-10-02 18:09:56 UTC (RELENG_6, 6.4-STABLE) >> 2009-10-02 18:09:56 UTC (RELENG_6_4, 6.4-RELEASE-p7) >> 2009-10-02 18:09:56 UTC (RELENG_6_3, 6.3-RELEASE-p13) > Hi folks, > > I just got some problem when compling my kerne. Here we go: > > rm -f hack.c > MAKE=make sh /usr/src/sys/conf/newvers.sh WILLSZPROXY > cc -c -O -pipe -std=c99 -g -Wall -Wredundant-decls -Wnested-externs > -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline > -Wcast-qual -Wundef -Wno-pointer-sign -fformat-extensions -nostdinc > -I. -I/usr/src/sys -I/usr/src/sys/contrib/altq -D_KERNEL > -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common > -finline-limit=8000 --param inline-unit-growth=100 --param > large-function-growth=1000 -mno-align-long-strings > -mpreferred-stack-boundary=2 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 > -mno-sse3 -ffreestanding -Werror vers.c > linking kernel.debug > kern_fork.o(.text+0x1d18): In function `fork1': > /usr/src/sys/kern/kern_fork.c:737: undefined reference to `knote_fork' > *** Error code 1 > > Stop in /usr/obj/usr/src/sys/WILLSZPROXY. > *** Error code 1 > > Stop in /usr/src. > *** Error code 1 > > Stop in /usr/src. > > My box running FreeBSD 7.2-STABLE. Thanks in advance. If you are on 7.2-STABLE only the EN patch would have been interesting for you. The FreeBSD-SA-09:14.devfs was not applicable to a 7.2-STABLE from 2009-05-18 and later. Can you please check that you didn't accidentally patch something that didn't need to be patched anymore? /bz -- Bjoern A. Zeeb It will not break if you know what you are doing. _______________________________________________ freebsd-security@... mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "freebsd-security-unsubscribe@..." |
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